Um... [ He's kind of just standing around as the guest entertains himself. ] I don't think ships can actually fly on their own.

[ Time to get on his tiptoes to try to peer over the other's shoulder to get a look at what- no, no, Zaveid's too tall. Chihiro's soon flat on his feet again as he draws his hands together. ]

I think rockets are able to move ships despite there being no air out there. Maybe the same laws just don't apply here with all the different ships but... I dunno how that could be. The outside has to be the same, after all.